test/built-ins/Array/prototype/reduce/15.4.4.21-5-6.js


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// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es5id: 15.4.4.21-5-6
description: >
    Array.prototype.reduce throws TypeError if 'length' is 0
    (subclassed Array, length overridden with obj with valueOf), no
    initVal
includes: [runTestCase.js]
---*/

function testcase() {
  foo.prototype = new Array(1, 2, 3);
  function foo() {}
  var f = new foo();
  
  var o = { valueOf: function () { return 0;}};
  f.length = o;
  
  function cb(){}
  try {
    f.reduce(cb);
  }
  catch (e) {
    if (e instanceof TypeError) {
      return true;
    }
  }
 }
runTestCase(testcase);